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Home My WebLink AboutCT 04-10A; POINSETTIA PLACE; RECLAIMED WATER THRUST BLOCK AND THRUST ANCHORS; 2012-05-15c1 o 4 .. 1 0 (~<) . LANDCONSULTANTStNC May 15, 2012 Mr. Constantine Abalos City of Carlsbad Construction Management & Inspection 5950 El Camino Real Carlsbad, CA 92008-8802 2834 La Mirada Drive Suite H Vista, California 92081 (760) PAN.GAEA Re: Poinsettia Lane CT 04-10(A) - Reclaimed Water Thrust Block and Thrust Anchor Dear Constantine, Poinsettia Lane Improvement Plan 469-513, Sheet 4, includes the installation of a 12" reclaimed water main which will connect to the existing 18" reclaimed water main at the intersection of Cassia Road and Poinsettia Lane. The existing 18" PVC reclaimed water main was constructed by City of Carlsbad improvement 341-5 sheets 8 and 21. The existing 18" PVC generally heads southeast in Poinsettia Lane and makes a 90 degree turn in the intersection and heads northeast in Cassia Road. The Poinsettia Lane Improvement Plan 469-513 proposes removing the existing 18" - 90 degree bend and installing a new 18"x18"x1 8" tee with a 18"x12" reducer installed on the southeasterly leg of the tee for the extension of the new 12" reclaimed water main along the Poinsettia Lane extension. The improvement plan pictorially shows a thrust block at the new tee. The City plan check review process did not request Pangaea to review and determine a size for this thrust block. Field inspection is requiring Pangaea to review and determine the appropriate thrust protection at this new tee and reducer. The following design considerations have been used to determine the appropriate thrust anchorage: The maximum static water pressure in the existing 18" water main is 134 PSI. The existing 18" PVC reclaimed water main has restrained joints 60 feet(per drawing 341-5) up Poinsettia and Cassia from the 90 degree bend. The proposed 12" reclaimed water main will be CML&C steel pipe with welded joints for 45 feet southeast of the new tee before converting to PVC. The soil baring pressure is a maximum of 2,000 PSF per Sect. 6.5.1 of the project's soils report. Water Agencies Standards design guidelines, Section 5.2 'Thrust Restraint and Anchor Blocks". Pangaea has determined that the new tee will require the following thrust protection: 1) the Tee shall have a thrust block with a minimum of 45 square feet of bearing area (see exhibit 'A' attached), and 2) the 18"x12" reducer on the southeast leg of the Tee shall have a thrust anchor (see exhibit 'B' attached). These thrust details will be shown on drawing 469-513 final as-built plans. Please let me know if you have any questions or need any additional information. Srel % 444&4, Richard C. Brasher RCE: C 43819, Expiration: 6/30/2013 Pangaea Land Consultants 2834 La Mirada Drive, Suite H Vista, California 92081 t: 760.PAN.GAEA (726-4232), f: 760.727.1405 (9oFESS,q ((low:No. 43819 rn Exp. 6/30/13 )i TO OF CAO!~~ P:Active Projects\Poinsettia Place\Field Revision Letters\Reclaimed Water Thrust Block and Anchor.docx _ J11 OORO H i 1.5 L Jyçffi \ _____ U .., $i=!'- uj 1.5 8 USE BRANCH SIZE OF - - TEE TO DETERMINE SIZE OF THRUST BLOCK PLAN VIEW uj TRENCH WIDTH INSTALL BLOW-OFF OR MANUAL CL AIR RELEASE ASSEMBLIES AT -- THE END OF CAPPED PIPES - TRENCH SECTION MINIMUM BEARING AREA OF BLOCK IN SQUARE FEET HEIGHT= BRG AREA SIZE 4" 6" 8" 10" 12' 14" 16" 18" TEE 3 6 10 15 21 28 36 45 CAP 3 6 10 15 21 28 36 45 WIDTH =2 x HEIGHT NOTE BASED ON SOIL BEARING CAPACITY OF 2000 LBS/SF. SPECIAL DESIGN REQUIRED IF SOIL BEARING CAPACITY IS LESS THAN 2000 LBS/SF. PLACE CONCRETE AGAINST UNDISTURBED GROUND IN TRENCH BOTTOM AND SIDE. 4"-18" WATER MAINS -0-150 PSI ITEM DESCRIPTION I DUCTILE IRON PIPE WITH NON-RESTRAINED JOINTS _2_ STEEL PIPE, CML&C WITH NON-RESTRAINED JOINTS 3 CL 150 PVC PRESSURE PIPE, 12 INCHES & SMALLER WITH NON-RESTRAINED iT 4 DR 18 PVC DISTRIBUTION PIPE, 14 INCHES & LARGER WINON-RESTRAINED iT DUCTILE IRON TEE FOR DI OR PVC PIPE - STEEL OUTLET NOT SHOWN 6 DUCTILE IRON CAP FOR DI OR PVC PIPE - STEEL BULKHEAD NOT SHOWN 7 POLYETHYLENE ENCASEMENT 8 CONCRETE THRUST BLOCK I E)OA 'A' OR® B TRENCH WIDTH B 3" CLR #6 12" OC 2 #6 EACH SIDE OF REDUCER 2 #4 EACH SIDE OF REDUCER #4@ P OC TRENCH SECTION NOTE: BASED ON SOIL BEARING' CAPACITY OF 2000 LBS/SF. SPECIAL DESIGN REQUIRED IF SOIL BEARING CAPACITY IS LESS THAN 2000 LBS/SF. PLACE CONCRETE AGAINST UNDISTURBED GROUND IN TRENCH BOTTOM AND SIDES. PLAN VIEW MINIMUM DIMENSIONS OF BLOCK IN INCHES SIZE 16" 14" 12" 10" 8" 6" 4" 181, A=I9 B=II A=19 B=2Tf A=I9 B=33 A=I9 B=35 A=I9 B=38 C=I2 0=42 C=I2 0=42 C=I2 0=42 C=I8 0=48 C=I8 0=54 A=I8 B=II A=18 B=22 A=I8 B=32 A=I8 B=32 A=I8 B=38 C=I2 0=42 C=I2 0=42 C=12 0=42 C=I8 0=48 C=I8 0=48 14" A=16 B=11 A=I6 B=I8 A=16 B=27 A=16 B=32 C=12 0=42 C=12 D=42 C=12 0=42 C=12 D=42 A=I4 B=II A=I4 13=I4 A=I4 13=22 A=I4 B=27 C=I2 D=42 C=I2 0=42 C=I2 0=42 C=I2 D=42 10" A=12 B=9 A=I2 13=I1 A=12 13=I6 C=I2 0=36 C=I2 0=42 C=I2 D=42 8" A=1I B=9 A=II 13=1I C=12 D=36 I C=12 0=42 A=9 B=9 C=I2 0=36 4"-I8" WATER MAINS - 0-150 PSI iT 6 1 DUCTILE IRON FLANGE ADAPTER WITH CL 150 FLG x MECHANICAL iT OR PUSH ON 7 1 POLYETHYLENE ENCASEMENT CONC STEEL E:xi*i•- te